But just copying your foe's thing means you cannot Clone what your deck was built around - your stuff
Enchantment - Saga Fall of Gil-galad (As this Saga enters and after your draw step, add a lore counter
However, its ability means that its a harsh sacrifice for opponents to have to take to get rid of it
Aristocrats - There are a number of builds that run cheap one and 2-drop fodder and then sacrifice them to engines for various game winning effects and death triggers like Blood Artist
I'll drop word for one of the best of those payoffs, because I just freaking' love this pinging ol' dragon: Niv-Mizzet, Parun
Our options are therefore as follows: Azorius v Jund: Will, Scion of Peace & Ikra Shidiqi, the Usurper + Kediss, Emberclaw Familiar Rakdos v Bant: Judith, Carnage Connoisseur & Shanna, Purifying Blade Selesnya v Grixis: Trelasarra, Moon Dancer & Solkanar the Swamp King Boros v Sultai: Firesong and Sunspeaker & Zimone and Dina Golgari v Jeskai: Beledros Witherbloom & The Archimandrite Okay, there should be six, but if you can find an oppositional pair in Dimir and Naya that can both be reasonably called a life gain deck, go for it